cling (v.) Look up cling at Dictionary.com
Old English clingan "hold fast, congeal, shrivel," from Proto-Germanic *klingg- (cf. Danish klynge "to cluster;" Old High German klinga "narrow gorge;" Old Norse klengjask "press onward;" Danish klinke, Dutch klinken "to clench;" German Klinke "latch"). The main sense shifted by 13c. to "adhere, stick together." Related: Clinging.